Not yet but we plan to do it soon. I can do a quick recap of each leader abilities here:
Hugo : Attack 8 for each of your guys
Timber: Damage 1 for each of your guys
Morphun: you get one pillz after each turn (so up to 3 per fight)
Bridget: you get one HP after each turn (so up to 3 per fight)
VanSaar: all your guys get a 20% bonus on the XP earned during fight
Ashigaru: CounterStrike, your opponent always play first.
Ambre: I cannot reveal it know as no one has unlock her max level yet.

Note that all leaders have the same bonus, cancel leader, meaning that if you have to leader in your team, no ability is triggered

Most of the other abilities are based on bonus/malus on damage / power and attack of the character or its opponents. The Game's Rule link should help you understanding these.